feat(types): add native C scalar types and imported aliases

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

3 files changed, 33 insertions, 1 deletions

diff --git a/include/cps/Lexer.h b/include/cps/Lexer.h
index 2876a58..2f6f231 100644
--- a/include/cps/Lexer.h
+++ b/include/cps/Lexer.h
@@ -89,6 +89,11 @@ enum Token {
     tok_endclass = -605,
     tok_public = -606,
     tok_private = -607,
+    tok_c_type = -608,
+    tok_c_int = -609,
+    tok_c_char = -610,
+    tok_c_string = -611,
+    tok_c_double = -612,
 
     tok_try = -700,
     tok_catch = -701,
diff --git a/include/cps/TypeAST.h b/include/cps/TypeAST.h
index a23f836..95c1d6d 100644
--- a/include/cps/TypeAST.h
+++ b/include/cps/TypeAST.h
@@ -8,6 +8,17 @@
 
 namespace cps {
 
+// TYPE <name> = C_TYPE("<C type expression>")
+class CTypeDeclAST : public StmtAST {
+    std::string Name;
+    std::string Expression;
+public:
+    CTypeDeclAST(std::string Name, std::string Expression)
+        : Name(std::move(Name)), Expression(std::move(Expression)) {}
+    const std::string &getName() const { return Name; }
+    const std::string &getExpression() const { return Expression; }
+};
+
 // ---- User-defined type declarations (CIE 9618 §4.1) ----
 
 // One field of a record TYPE body. Plain data, not a statement node, so the
diff --git a/include/cps/TypeSystem.h b/include/cps/TypeSystem.h
index 2ef1cd6..20c485f 100644
--- a/include/cps/TypeSystem.h
+++ b/include/cps/TypeSystem.h
@@ -29,7 +29,9 @@ enum class TypeKind {
     Void,
     Enum,
     Record,
-    Pointer
+    Pointer,
+    CScalar,
+    CPointer
 };
 
 // ---- Per-kind payloads (filled only for the matching TypeKind) ----
@@ -68,6 +70,16 @@ struct TypeInfo {
     EnumPayload Enum;       // Kind == Enum only
     PointerPayload Pointer; // Kind == Pointer only
 
+    // C aliases share an identity even when their pseudocode names differ.
+    std::string CIdentity;
+    unsigned CRank = 0;
+    bool CSigned = false;
+    std::string CInputFormat;
+    std::string COutputFormat;
+
+    bool isC() const;
+    bool sameType(const TypeInfo *Other) const;
+
     bool isNumeric() const;
     bool isIntegral() const;
     bool isReal() const;
@@ -125,6 +137,10 @@ public:
     bool definePointer(const std::string &Name,
                        const std::string &PointeeName,
                        std::string &Err);
+    bool defineCAlias(const std::string &Name, const std::string &Expression,
+                      std::string &Err);
+    const TypeInfo *importCType(const std::string &Expression, std::string &Err);
+    bool sameType(const std::string &Left, const std::string &Right) const;
 
     const EnumConstant *lookupEnumConstant(const std::string &Name) const;